Launch the Eclipse IDE, and open the project import wizard via File > Import... > General / Existing Projects into Workspace. In the project wizard window, activate the radio button Select root directory and specify the location of the JPMML-Evaluator-Bootstrap directory. Click Finish to close the project wizard window.

The Eclipse IDE will show the imported JPMML-Evaluator-Bootstrap project in the package explorer view as jpmml-evaluator-bootstrap. The project consists of a single Java source code file org/jpmml/evaluator/bootstrap/Main.java (located under Apache Maven's standard source directory src/main/java).